Ive schrieb:

> You are aware that you are breaking the poor mans idea of encapsulation 
> by directly accessing the fields from png_inf ;)
> 
> And it's by no means time critical, so why not just use the API call?

Because POV-Ray currently uses the same construct to check for presence 
of a gAMA chunk?

No other reason.

> The sRGB viewing gamma of 1.125 is just another (poor mans) attempt of 
> taking the environment illumination of some typical pc user into 
> account. There are much more complicated attemps from the ICC and I 
> really think we do not need to care about this.

So, in other words, it is indeed just a recommendation for viewing 
software? Something like, "guys, this encoding scheme makes sure you can 
reconstruct the linear data - we suggest however you don't just 
compensate for actual hardware gamma, but also for viewing environment; 
if in doubt, we suggest trying to achieve those 1.125". Did I get that 
right?

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